Hi Elaine,
Welcome to mobileread.
Yes pricing differences are a known issue and have been a source of angst for many eBook readers, except for those that bought Kindles. Right now nobody beats the kindle price, though there are exceptions here and there.
To do a good price comparison I'd recommend a newly created site called inkmesh.com. They do a great job of collecting prices from the more popular online bookstores.
One way to get good prices on eBooks is to wait for sales by BooksOnBoard(BoB), FictionWise, and eReader.com. Unfortunately only offers books with DRM that works on the SONY. Many however buy books and remove the DRM and convert them the ePUB/LRF so they can be read on their ereading device.
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